guozhangwang commented on a change in pull request #8496:
URL: https://github.com/apache/kafka/pull/8496#discussion_r418214162
##########
File path:
streams/src/test/java/org/apache/kafka/streams/integration/EosBetaUpgradeIntegrationTest.java
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@@ -1064,14 +1071,16 @@ private void addAllKeys(final Set<Long> allKeys, final
List<KeyValue<Long, Long>
// must be public to allow KafkaProducer to instantiate it
public static class KeyPartitioner implements Partitioner {
+ private final static LongDeserializer LONG_DESERIALIZER = new
LongDeserializer();
+
@Override
public int partition(final String topic,
final Object key,
final byte[] keyBytes,
final Object value,
final byte[] valueBytes,
final Cluster cluster) {
- return ((Long) key).intValue() % NUM_TOPIC_PARTITIONS;
+ return LONG_DESERIALIZER.deserialize(topic, keyBytes).intValue() %
NUM_TOPIC_PARTITIONS;
Review comment:
What I was asking is for the necessity of
```
properties.put(StreamsConfig.producerPrefix(ProducerConfig.PARTITIONER_CLASS_CONFIG),
KeyPartitioner.class);
```
As I mentioned, Streams has its own StreamsPartitioner, and if it can get
the actual not-null `partition` value passing to the `send` call, then the
embedded producer's partitioner would not be used. Maybe I missed something
critical here --- did you mean this config is only used for sending data to the
source topics? If yes why put it into a streams props?
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